basis of record Reid D.G. & Geller J.B. (1997). A new ovoviviparious species of Tectarius (Gastropoda: Littorinidae) from Niue, South Pacific, with a molecular phylogeny of the genus. Journal of Molluscan Studies 63:207-233. [details]

additional source Reid, D.G. (1989a) The comparative morphology, phylogeny and evolution of
the gastropod family Littorinidae. Philosophical Transactions of the Royal
Society of London, Series B 324: 1-110. [details]

original description(ofEchininus viviparus Rosewater, 1982) Rosewater, J. (1982). A new species of the genus Echininus (Mollusca: Littorinidae: Echininae) with a review of the subfamily. Proc. Biol. Soc. Wash. 95 (1): 67-80. [details]